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There is a check valve in the resirvoir or in the line to keep from bleeding the vacuum on acceleration. You can get one from the parts store and put it in the line going in cab. The resirvoir is either a black can looking thing or round plastic ball with a vacuum line going in from the intake and one going out and into the cab. The ball will have a check valve inside but if it has a can it doesn't. It will be in the line.

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โˆ™ 2015-07-16 18:06:31
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Q: If the air conditioner on a 1998 Ford Expedition blows out the defroster when accelerating is it from a broken or cracked vacuum hose or canister?
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